1, jeans are disinfected irregularly for vaginitis. When the weather is hot, a small number of pathogenic bacteria in the vagina can breed in this environment, some of them are killed by normal flora in the vagina, and the other part can be parasitic on jeans with sweat or other secretions. If jeans can't be cleaned in time, it will easily become a hotbed of bacteria, infect genitals again, and even spread to the pelvic cavity. Long-term chronic infection will do great harm to women's reproductive health, and severe cases will lead to infertility! 2, low-waisted jeans urinary tract infection Women are more vulnerable to external bacteria than men because of their special body structure, suffering from some diseases, just like urinary tract infection. Urinary tract infection is very common in women, which is mainly due to the short urethra of women, and the urethra is more susceptible to bacterial invasion than men. Moreover, the female urethral orifice is close to the anus, which is likely to be in danger of being invaded by Escherichia coli. 3, tight jeans circulation is not good, cold hands and feet Many white-collar women choose to wear tight jeans when they go to work, sitting for a day and not exercising at all. In the long run, it will lead to poor blood circulation of lower limbs. The most common manifestations are: cold feet, swollen calves, dull skin and even frostbite. If you wear tights during menstruation, it may bring dysmenorrhea problems, or aggravate the original dysmenorrhea problems. 4, sand washing jeans silicosis sand washing is an industrial technology, used to make jeans and other clothing look faded and outdated. It needs to apply high pressure to denim and then bake the tiny particles of silicon dioxide with fire to achieve the above effect. But if the human body inhales a lot of silica dust, it will be threatened by silicosis. Silicosis patients generally have no symptoms or early symptoms are not obvious. If they lack the habit of regular physical examination, it is easy to miss the diagnosis and delay their illness. Symptoms of silicosis (2) Cough and expectoration caused by dust stimulation and respiratory inflammation; (2) Chest tightness, shortness of breath, dizziness, fatigue, palpitation, anorexia and other symptoms; (3) 40%-60% of patients with chest pain have needle chest pain. Most of them are located on one or both sides of the middle and upper part of the chest, which has nothing to do with breathing, posture and labor, and often appears in rainy days and changeable climate. 5. Common problems of jeans Formaldehyde exceeds the standard. Usually, in order to make jeans smoother, more wrinkle-resistant and more intense in color, workers may add chemicals containing formaldehyde in the production process. If the dosage is not controlled during the processing, the formaldehyde content may exceed the standard. In the process of bleaching, dyeing and washing denim trousers with different shades of color, substances containing formaldehyde may also be used. Jeans with these characteristics are often the first choice for many girls to buy. The harm of formaldehyde can be described as pervasive: it can not only stimulate the skin and mucosa, but also have a strong sensitization effect, which can cause allergic dermatitis, pigmentation and necrosis. Inhalation of high concentration formaldehyde can induce bronchial asthma. More seriously, it also has a mutagenic effect, which can cause nasopharyngeal tumors, neonatal malformations and so on.